103results about How to "Simple structure processing" patented technology

The invention discloses a dual-band co-aperture flat array antenna which is applied to multiband homing heads and intelligent ammunition guidance systems. The dual-band co-aperture flat array antenna comprises a single-ridge waveguide slot array surface, a substrate integrated waveguide slot array surface, single-ridge waveguide slot array feed networks and a substrate integrated waveguide slot array feed network. The single-ridge waveguide radiation slot array surface comprises a plurality of rows of parallel single-ridge waveguide radiation slot line arrays; a substrate integrated waveguide radiation slot array comprises a plurality of rows of parallel substrate integrated waveguide radiation slot line arrays; an antenna array surface is divided into four quadrants; the feed networks respectively feed array surfaces of the four quadrants so as to have the condition of realizing a single-pulse function; each quadrant has two sets of feed networks for respectively feeding the single-ridge waveguide slot line arrays and the substrate integrated waveguide slot line arrays; the single-ridge waveguide slot array surface works in an X-band; the substrate integrated waveguide slot array surface works in a Ka-band; arrays of two forms have a common aperture and do not mutually affect; and the problem of electromagnetic wave blocking caused by non-coplanar array surfaces is solved.

The invention relates to a surface artificial electromagnetic material applied to directional radiation modulation. The material is manufactured by the following steps of: (1) selecting a base metal material; (2) determining the shape of a center feed source and the frequency band of a radiation source; (3) determining the period p, the width w and the groove depth l of a type-a groove to be manufactured; (4) determining the period d, the width a and the depth h of a type-b groove; and (5) manufacturing a period type-A groove and a period type-B groove on one side on a metal substrate so as to obtain the surface artificial electromagnetic material with directional radiation. The surface artificial electromagnetic material can realize the modulation of equivalent wave vectors of metal surface waves. Under the combined action of the type-A groove and the type-B groove, the surface artificial electromagnetic material can achieve the regulation and control on far-field radiation characteristics.

The invention discloses a hydraulic cylinder which comprises a rod cavity end cover (1), a cylinder barrel (2), a piston rod (3), a piston (6) and a rodless cavity end cover (12), wherein an oil duct (B) is arranged on the rod cavity end cover (1); an oil duct (A) is arranged on the rodless cavity end cover (12); and the inner cavity of the hydraulic cylinder barrel (2) is divided into a rod cavity and a rodless cavity through the piston rod (3) and the piston (6). The hydraulic cylinder disclosed by the invention is characterized in that at least a buffer jacket is arranged on the piston rod (3); the buffer jacket comprises a first buffer jacket (4) and / or a second buffer jacket (11); the buffer jackets (4) and (11) can make an axial slide along the piston rod (3); and axial throttle oil ducts (301a) and (301b) are arranged between the buffer jackets (4) and (11) and the piston rod (3).

The invention relates to a novel high power water load. The novel high power water load comprises a waveguide radiation horn mouth, a base, a spiral water chamber, a terminal short circuit block, and a protection housing disposed on the outer side of the spiral water chamber. Spiral type flowing water used as a microwave absorber is disposed in the spiral water chamber. The front end of the spiral water chamber is in the shape of a cone, and the rear end of the spiral water chamber is in the shape of a cylinder. One end of the waveguide radiation horn mouth is fixedly connected with an output radiation waveguide, and the other end of the waveguide radiation horn mouth is connected with the base. The other end of the base is connected with the rear end of the spiral water chamber and the bottom part of the protection housing, and the side of the base connected with the spiral water chamber is provided with a groove embedded in the rear end bottom part of the spiral water chamber. The side of the rear end of the spiral water chamber connected with the base is a water inlet, and the side of the front end of the spiral water chamber is a water outlet. The front end of the terminal short circuit block is in the shape of a cone, and is embedded in the front end of the spiral water chamber, and the rear end of the terminal short circuit block is connected with the top part of the protection housing. The water load is capable of satisfying use requirements of a high power millimeter wave electric vacuum device, and at the same time, the broadband low reflection of the water load is realized.

The invention discloses a difficult-to-deform metal sheet electric field assisted deep drawing device, and belongs to the technical field of solid particle forming dies under the action of an electricfield. A male die fixed to the lower portion of a press machine and used for conducting insulating treatment together with the press machine and a female die arranged at the upper portion of a lowerdie seat and provided with an inner hole are included, insulating layers are arranged on the upper surface of the female die and the side wall of the inner hole of the female die, the upper end of thefemale die is provided with a blank holder for pressing a plate sheet on the female die, the bottom of the inner hole of the female die is provided with an elastic block, the lower end of the blank holder is provided with a positive electrode which is in contact with the plate sheet and is connected to a power supply firing line, the inner side wall of the female die is provided with a female dieelectrode connected to a power supply zero line, and the top end of the elastic block is provided with a negative electrode connected to the power supply zero line. The difficult-to-deform metal sheet electric field assisted deep drawing device is simple in structure, high in forming efficiency, less in labor time and stable in product quality.

The invention discloses a microwave oven which comprises an oven chamber, a power distribution chamber, a magnetron, and an oven chamber upper cover provided thereon with a spherical surface raised towards the interior of the oven chamber. The magnetron is arranged on a side plate of the oven chamber in a way that a microwave-emitting antenna on the magnetron is aligned with the focus of the spherical surface. A magnetron shell envelopes the magnetron inside and is arranged on the side plate of the oven chamber. A magnetron holder inside the magnetron shell has a non-uniform thickness, so that a microwave-emitting antenna on the magnetron shell is inclined upwards. Alternatively, a tapered magnetron shell fixing supporter is arranged between the side plate of the oven chamber and the magnetron shell, to allow the magnetron shell to be inclined upwards. Since the microwave is scattered to heat foods in all directions, the invention prevents the dead area of microwave cooking, avoids the non-uniform heating of foods due to the influence of microwave distribution on foods, increases the cooking speed and microwave efficiency, and prolongs the service life of magnetron.

The invention relates to an anti-cold bridge aluminum plastic tee of air conditioner matching pipe fittings, which is designed for solving the technical problems of relatively high manufacturing and maintenance cost and low structural stability of the traditional same kind of products. The aluminum plastic tee comprises a tee, an aluminum pipe, a lining strip, a tee connection aluminum pipe and an aluminum pipe connection lining strip. The anti-cold bridge aluminum plastic tee is characterized in that the tee comprises an aluminum outer frame and an engineering plastic inner frame; the frame surface of the inner frame connected with the aluminum pipe is provided with an elastic resisting block; and the elastic resisting block butts against the inner wall of the aluminum pipe. The outer frame is provided with an integrally connected connection block. The anti-cold bridge aluminum plastic tee provided by the invention has good structural stability and tightness and relatively low manufacturing cost, and is convenient to maintain and replace and suitable for structural improvement of the existing similar products.

The invention discloses a nano fiber artificial blood vessel for catalyzing and releasing nitric oxide and a preparation method. The artificial blood vessel consists of a three-dimensional reticular non-woven film pipe structure formed by an inner layer and an outer layer of nano fibers. The artificial blood vessel is prepared by the following method comprising the following steps of: dissolving gelatin in glacial acetic acid to prepare a solution; adding a sodium heparin aqueous solution to prepare a spinning dope for electrostatic spinning to form nano fiber non-woven film pipes; dissolving polyurethane and nantokite chelate in a mixed solution of tetrahydrofuran and N,N-dimethyl fomamide to prepare a polyurethane spinning dope; carrying out electrostatic spinning to continue collecting polyurethane fibers on a collecting roller with the nano fiber non-woven film pipes so as to form polyurethane fiber non-woven film pipes; and soaking and treating the polyurethane fiber non-woven film pipes in an aqueous solution of a crosslinking agent. The artificial blood vessel can catalyze and release nitric oxide for a long time in vivo and in vitro and is beneficial to inhibiting the aggregation of platelets. The preparation method is simple, and the crosslinking degree is easy to control.

The invention provides an encephalic electrode. A rigid outer tube is sleeved with an electrode body. In the use process, the electrode body is firstly taken out, the outer tube is inserted into the cranium, and due to the fact that the outer tube is rigid, the outer tube can be conveniently inserted into the cranium under stress. After the outer tube is used for precise locating, the electrode body is inserted into the outer tube, and due to the fact that the electrode body is flexible, in the process of inserting the electrode body into the outer tube from one end, the electrode body stretches into the outer tube under the condition of elastic deformation and stretches out from an opening; after the arc-shaped stretches out, after the electrode body is restored to the original shape and reaches the position, the outer tube can be drawn out, the electrode body is in contact with surrounding brain tissue, and the condition of the brain is detected. According to the encephalic electrode, the arc-shaped end is arranged at the front end of the electrode body, after the arc-shaped end is arranged, the electrode body can be rotated to adjust the position of the arc-shaped end at the front end in the cranium, and therefore the range of implementing the electrocoagulation damage operation or radiofrequency ablation is greatly widened; through testing, in the same state of other conditions, compared with a vertical electrode, the range is widened by about 8 times.

The invention discloses a radar collision triggering assembly and a cleaning robot. The radar collision triggering assembly comprises a radar driving board, a triggering button circuit board, a radar,an upper housing, a radar support, an elastic collision piece, a rotating shaft and a rotating shaft support; on the top surface of the upper housing, the rotating shaft support and the elastic collision piece are installed on the corresponding side faces of a radar mounting groove respectively, the triggering button circuit board is mounted on the back surface of the upper housing, a triggeringthrough hole runs through the middle of a button mounting groove and the top surface of the upper housing, and the edge of the radar support is provided with a squeezing bone site; the rotating shaftpenetrates through the rotating shaft support and the radar support, the elastic collision piece is assembled in an elastic collision piece mounting groove, and when the radar support is not hit by anexternal object, the elastic collision piece is used for controlling the squeezing bone site to suspend over the top surface of the upper housing through the radar support; when the radar support ishit by an external object, the radar support rotates around the axis of the rotating shaft, so that the squeezing bone site penetrates through the triggering through hole to squeeze a button contact on the triggering button circuit board.

The invention discloses a movable contact spring of a relay, which has good anti-contact adhesion performance. The movable contact spring of the relay comprises a body (1), wherein the body (1) is provided with a first notch (2) and a second notch (3); and the part of the body (1), which is located between the first notch (2) and the second notch (3), is a movable contact mounting part (4).

The invention relates to the technical field of sound absorption, in particular relates to a controllable sound absorption structure. The controllable sound absorption structure comprises a base body and a piezoelectric film fixedly arranged on the base body, wherein a cavity is formed between the base body and the piezoelectric film; a plurality of penetrating sound absorption holes are formed in the piezoelectric film; a noise frequency collection element is used for acquiring the frequency of environmental noise; a voltage modulation circuit is electrically connected with the piezoelectric film through a lead wire; the signal receiving port of the voltage modulation circuit is connected with the signal output port of a noise frequency collection element so as to apply excitation voltage to the piezoelectric film. Compared with the prior art, the controllable sound absorption structure has the advantages that in the working process, the voltage modulation circuit can apply an excitation electric field to the piezoelectric film, so that the apertures of the sound absorption holes in the piezoelectric film are correspondingly changed, and the controllable active sound absorption performance of the sound absorption structure to noise with different frequencies is realized; therefore, the effective sound absorption frequency band of the sound absorption structure is expanded. Compared with the prior art, the controllable sound absorption structure has the characteristics of high easiness in structural processing, low production cost and outstanding sound absorption effect.

The invention relates to a positioning structure of a negative-pressure adsorption-type wall-surface mobile robot centrifugal impeller. The positioning structure comprises an impeller laminating tray, an impeller air inlet positioning piece and an impeller shaft, wherein the impeller laminating tray is fixed on the outer wall of a robot seal cavity; the impeller air inlet positioning piece is fixedly connected with the inner circle of the laminating tray and provided with an inner ring; the impeller shaft penetrates through the centrifugal impeller and the inner ring of the impeller air inlet positioning piece; the impeller shaft is connected with a driving gear through a spline on the top end of the impeller shaft and drives the impeller to rotate through a keyway and a key corresponding to the centrifugal impeller; the upper end and the lower end of the impeller shaft are respectively connected with an upper end sleeve and a lower end sleeve through bearings; the central hole in an impeller housing is sleeved outside the upper end sleeve; the lower end sleeve is connected with the inner ring of the impeller air inlet positioning piece through a screw thread; the exterior of each sleeve is provided with screw threads; and when the nut is screwed, the sleeves can drive the impeller shaft to move up and down within a narrow range, thereby realizing the fine adjustment of the gap between the impeller and the laminating tray. By using the positioning structure, the impeller does not need to be fixed to the motor shaft, thereby solving the problem of the connection between the impeller and the seal cavity.

The invention discloses a topological optimization design method of a submarine cable bending protector. The topological optimization design method comprises the following steps: establishing an initial three-dimensional model of the submarine cable bending protector; importing the initial three-dimensional model into an OptiStrut module of the HyperMesh software; meshing the initial three-dimensional model and defining material attributes of the initial three-dimensional model; performing topological optimization design on the three-dimensional model of the submarine cable bending protector;determining three load sets and two working conditions are created, loads and constraints of the load sets, and defining topological optimization design variables; selecting a topological optimizationmodel component to contain all design attributes in the initial three-dimensional model, defining a mass fraction lower limit value and an objective function of the initial three-dimensional model asminimum strain energy, and performing iterative optimization and calculation solution on the density of the submarine cable bending protector; and comparing the two-dimensional topological optimization design result with the three-dimensional topological optimization design result to verify the accuracy of the three-dimensional topological optimization design result.

The invention discloses a low-pass filter with a changeable cavity width, and the filter comprises a base with a metal cavity, a cover plate which is arranged on the base, metal wires, insulating materials and at least three metal sheets which are arranged in the metal cavity; the metal sheets are connected together through the metal wires and are insulated from the metal cavity through the insulating materials; the cross section of the metal cavity is in a rectangular shape; the transverse section of the inner side wall of the metal cavity is in a rectangular wave shape; both end surfaces of the metal sheets are in the crest of the rectangular wave. The low-pass filter with the changeable cavity width has the advantages of simplicity in structure processing, convenience in debugging and high pass-band cut-off frequency, and is expected to be widely applied to electronic systems in various microwave bands, particularly radar, missile guidance, communication and other military and civilian fields.

The invention discloses a hydraulic oil cylinder which comprises a rod cavity end closure, a cylinder barrel, a piston rod, a piston and a rodless cavity end closure, wherein the inner chamber of the hydraulic cylinder barrel is divided into a rod cavity and a rodless cavity by the piston rod and the piston; the piston rod is provided with a buffering sleeve which comprises a first buffering sleeve and / or a second buffering sleeve; the buffering sleeve can slide along the axial direction of the piston rod; an axial throttling oil passage is arranged between the buffering sleeve and the piston rod; the first buffering sleeve is provided with a sealing end surface; a sealing end surface is arranged on the rod cavity end closure; hydraulic oil in the rod cavity is discharged to an oil passage through the throttling oil passage; the end surface of the second buffering sleeve is in contact with the sealing end surface of the rodless cavity end closure to form a sealing; and the hydraulic oil in the rodless cavity is discharged to the oil passage through the throttling oil passage. The invention provides a buffering mechanism of the hydraulic oil cylinder; and the buffering mechanism has longer service life, has lower requirement on the accuracy of manufacturing and is convenient for organizing production.

The invention provides a two-belt interlocked armoring machine in order to resolve the problems that an existing armoring machine is low in armoring speed and low in production efficiency. The two-belt interlocked armoring machine comprises a main motor and a main shaft, wherein a synchronous pulley is installed at one end of the main shaft, a rotary disc is installed at the other end of the main shaft, two belt storage discs are fixed at the two sides of the middle of the main shaft respectively, the main motor is connected with the synchronous pulley on the main shaft in a transmission mode, two shape pressing wheel sets and two forming hooks are arranged in the rotary disc, transmission shafts of the two shape pressing wheel sets are connected with two synchronous motors respectively, the two belt storage discs are connected with the two shape pressing wheel sets respectively through two guide wheels, and the two shape pressing wheel sets are connected with the two forming hooks respectively. The two-belt interlocked armoring machine achieves two-belt armoring, two belts are formed (through a mould) all at once and armored at the same time, and the production speed of the two-belt interlocked armoring machine is more than two times the armoring speed of an original single-belt armoring machine.

The invention relates to a positioning structure of a negative-pressure adsorption-type wall-surface mobile robot centrifugal impeller. The positioning structure comprises an impeller laminating tray, an impeller air inlet positioning piece and an impeller shaft, wherein the impeller laminating tray is fixed on the outer wall of a robot seal cavity; the impeller air inlet positioning piece is fixedly connected with the inner circle of the laminating tray and provided with an inner ring; the impeller shaft penetrates through the centrifugal impeller and the inner ring of the impeller air inletpositioning piece; the impeller shaft is connected with a driving gear through a spline on the top end of the impeller shaft and drives the impeller to rotate through a keyway and a key correspondingto the centrifugal impeller; the upper end and the lower end of the impeller shaft are respectively connected with an upper end sleeve and a lower end sleeve through bearings; the central hole in an impeller housing is sleeved outside the upper end sleeve; the lower end sleeve is connected with the inner ring of the impeller air inlet positioning piece through a screw thread; the exterior of eachsleeve is provided with screw threads; and when the nut is screwed, the sleeves can drive the impeller shaft to move up and down within a narrow range, thereby realizing the fine adjustment of the gap between the impeller and the laminating tray. By using the positioning structure, the impeller does not need to be fixed to the motor shaft, thereby solving the problem of the connection between theimpeller and the seal cavity.

The invention discloses a nano fiber artificial blood vessel for catalyzing an endogenous NO precursor to release NO and a preparation method. The artificial blood vessel consists of a three-dimensional reticular non-woven film pipe structure formed by an inner layer of nano fibers and an outer layer of nano fibers. The artificial blood vessel is prepared by the method comprising the following steps of: dissolving gelatin, ascorbic acid and sodium nitrite in water to prepare a solution; uniformly mixing the prepared solution with an aqueous solution of a crosslinking agent to ensure that the solution is pre-crosslinked; adding a sodium heparin aqueous solution to prepare a spinning dope; collecting fibers formed by spinning on a collecting roller to form nano fiber non-woven film pipes; dissolving polyurethane and nantokite chelate in a mixed solvent of tetrahydrofuran and N,N-dimethyl fomamide to prepare a polyurethane spinning dope; spinning and continuing collecting fibers on the collecting roller with the nano fiber non-woven film pipes so as to form polyurethane non-woven film pipes; and soaking and treating the polyurethane non-woven film pipes in the aqueous solution of thecrosslinking agent. The blood vessel can catalyze to release NO for a long time and is beneficial to inhibiting the aggregation of platelets in the artificial blood vessel. The method is simple, and the degree of crosslinking is easy to control.

The invention discloses a novel cylindrical roller bearing of a holder structure. The novel cylindrical roller bearing is composed of an inner ring, an outer ring, holder rollers, lateral plates, bolts, a rolling body, shaft pins and the like. A holder connects the holder roller with the two lateral plates by the shaft pins, and therefore rolling body separating and motion guiding of the rolling body are achieved. The rolling structure is adopted for the holder, sliding friction between the holder and the rolling body is converted into rolling friction, abrasion of the holder and the rolling body is reduced, and stability of moving of the holder is improved. The holder structure is simple in processing, is convenient to mount and is reliable is performance, and application in situations needing thigh impulse load bearing is achieved.

The invention discloses an artificial blood vessel for catalyzing an endogenous NO precursor to release NO and a preparation method. The artificial blood vessel consists of a three-dimensional reticular non-woven film pipe structure formed by an inner layer of nano fibers and an outer layer of nano fibers. The artificial blood vessel is prepared by the method comprising the following steps of: dissolving gelatin, ascorbic acid and sodium nitrite in water to obtain a spinning dope so as to prepare nano fiber non-woven film pipes; dissolving polyurethane and nantokite chelate in a mixed solvent of tetrahydrofuran and N,N-dimethyl fomamide to prepare a polyurethane spinning dope; continuing collecting fibers on a collecting roller with nano fiber non-woven film pipes so as to form polyurethane non-woven film pipes; soaking and treating the polyurethane non-woven film pipes in an aqueous solution of a crosslinking agent; and cleaning and drying to prepare the artificial blood vessel for catalyzing endogenous NO precursor to release NO. The artificial blood vessel can catalyze to release NO for a long time. The method is simple, and the degree of crosslinking is easy to control.

The invention provides a downward-opening type positioning device for a segmented mold arch seat. The positioning device comprises arch seats, wherein the arch seats are arranged at the lower part of an upper cover plate; inner positioning blocks and outer positioning blocks are arranged on the circumference of the upper cover plate and are arranged in a staggered manner; a groove matched with the inner positioning block is arranged at the middle part of the upper end of each arch seat; and each arch seat is arranged between two outer positioning blocks on the upper cover plate. The downward-opening type positioning device for the segmented mold arch seat is characterized in that each arch seat is co-positioned by an inner positioning block in the middle part and two outer positioning blocks at two sides and is not easy to move. With the downward-opening type positioning device, the problem of positioning of a segmented mold arch seat of an engineering giant wheel can be effectively solved; and meanwhile, the problems that an engineering giant tyre is thick in local rubber side and broken in figures are solved and the appearance quality of the tyre is improved. The downward-opening type positioning device with the structure is simple in processing and convenient in operation. Experiments demonstrate that the downward-opening type positioning device with the structure has the characteristics that quality tire in which the problems that the engineering giant tyre is thick in local rubber side and broken in figures exist are greatly reduced, the waste is reduced and remarkable economic benefits are obtained.

The invention relates to the field of street lamps, in particular to an irradiation angle-adjustable microwave ion street lamp and a realization method. The irradiation angle-adjustable microwave ion street lamp comprises a stop device, an angle adjusting bracket, a microwave plasma lamp body fixed at the bottom of the angle adjusting bracket, and an angle adjusting sleeve; through holes and rotating shaft screw holes are symmetrically formed in two sides of the angle adjusting bracket; a stop screw hole and a rotating shaft are arranged on the angle adjusting sleeve; two sides of a rotating shaft are embedded in the rotating shaft screw holes in two sides of the angle adjusting bracket; and the stop device penetrates through the through holes and the stop screw hole, and is fixed on the angle adjusting bracket for stop positioning. The irradiation angle-adjustable microwave ion street lamp and the realization method, disclosed by the invention, use a differential principle for improving the level number of adjustable angle of the street lamp, effectively reduce the number of the holes when guaranteeing reliable fixation, and reduce the size of the microwave ion street lamp corresponding to use of a gear.

The invention provides a mooring type fastening assembly. The mooring type fastening assembly comprises a mooring type bolt and a connecting structure. The mooring type bolt comprises an outer sleeve piece, a lock sleeve, a spring, a half ring and a bolt which are arranged on the same axis. The outer sleeve piece and the lock sleeve are cylindrical. An inner cavity of the outer sleeve piece is divided into two segments which are a first outer sleeve piece inner cavity and a second outer sleeve piece inner cavity respectively, and the inner diameter of the first outer sleeve piece inner cavity is smaller than that of the second outer sleeve piece inner cavity. An inner cavity of the lock sleeve is divided into two segments which are a first lock sleeve inner cavity and a second lock sleeve inner cavity respectively, and the inner diameter of the first lock sleeve inner cavity is smaller than that of the second lock sleeve inner cavity. The bolt sequentially comprises a screw head, a screw and a threaded end. The mooring type fastening assembly high in integration degree is provided for overcoming the defects of an existing fastener, the problems that the existing fastener is larger in number of parts and not convenient to use and preserve, and potential safety hazards exist are solved, and a good effect is achieved when the mooring type fastening assembly is applied to an auxiliary power device.

The invention discloses an electrical contact assembly with a groove, which comprises a contact bridge and an electrical contact arranged on the contact bridge, the surface of the contact bridge facing the electrical contact is provided with the groove, the groove is arranged close to the intersection of the contact bridge and the electrical contact, and solder formed by welding is filled betweenthe groove and the edge of the electrical contact. The invention has the following advantages and effects: the design mode breaks through the conventional design thought of the existing electrical contact element, the change of the structure of the contact bridge product is adopted to limit the solder from climbing to the working surface of the electrical contact, and extra cost is not required tobe increased. The whole structure is easy to machine, accurate, effective and high in efficiency, and the finished product rate of products is increased.

The invention discloses a thermal expansion valve with a unidirectional control function. The thermal expansion valve comprises a valve body having an inlet passage and an outlet passage, a temperature sensing part disposed at one end of the valve body, and a first spool part disposed in an inner cavity of the valve body. The first spool part comprises a valve stem and a first spool; the valve stem is abutted to the temperature sensing part; the first spool coordinates with a first valve port in the inner cavity to control the quantity of medium fluid flowing from the inlet passage to the outlet passage. The valve body further comprises an accommodating portion extending from the inlet passage to the inside of the valve body. The accommodating portion is provided with a second valve port. A second spool part is disposed in the accommodating portion. A limit pin used for limiting an opening position of the second spool part is further disposed in the accommodating portion. When the medium flows from the inlet passage to the outlet passage, the second valve port is closed; when the medium flows from the outlet passage to the inlet passage, the second valve port opens. Compared with the prior art, the thermal expansion valve has the advantages that the influence upon flow capacity of the unidirectional valve is effectively decreased on the premise of improving manufacturability.

The invention discloses an engine cylinder gasket sealing structure. The engine cylinder gasket sealing structure comprises an air cylinder body and an air cylinder cover arranged on the air cylinderbody, wherein an air cylinder sleeve is arranged in the air cylinder body. The engine cylinder gasket sealing structure is characterized by comprising the air cylinder sleeve, wherein the air cylindersleeve is arranged between the air cylinder body and the air cylinder cover, a support boss is arranged on the inner wall of the air cylinder body, a support shoulder is arranged on the outer wall ofthe air cylinder sleeve, the support shoulder is abutted against the support boss, a boss and a compression bulge are arranged on the upper surface of the support shoulder, a groove is formed betweenthe boss and the compression bulge, the compression bulge and the air cylinder sleeve are in interference fit, and the upper surface of the periphery of the air cylinder body is flush with the edge of the upper surface of the compression bulge. The engine cylinder gasket sealing structure has the advantages that a cylinder gasket is of a structure simple to process and low in cost. The engine cylinder gasket sealing structure forms a whole circle of linear sealing structure, and not only is strong in sealing reliability, but also can effectively reduce sealing stress generated duet to compression. The engine cylinder gasket sealing structure solves problems of acting points of sealing force after the engine cylinder gasket sealing structure is assembled, and prevents that the deformationamount of the air cylinder sleeve is overlarge.

The invention discloses a low-pass filter based on a helical metal wire. The low-pass filter based on the helical metal wire comprises a base provided with a metal cavity, and a cover plate arranged on the base, and further comprises a metal wire, insulating materials and at least three metal plates disposed in the metal cavity. The metal plates are connected with one another through the metal wire, and the metal plates are insulated from the metal cavity through the insulating materials, and a portion of the metal wire between two adjacent metal plates is in a helical shape. The low-pass filter based on the helical metal wire has the advantages of being simple in structural processing, convenient to debug, and high in pass band cut-off frequency. The low-pass filter based on the helical metal wire is expected to be widely used in electronic systems of various microwave bands, especially in military and civil fields such as radar, missile guidance, communication and the like.

The invention discloses an electrical auxiliary bulging device for special-shaped parts. The device comprises a male mold, a female mold, a blank holder and a sleeve. The female mold is arranged in the sleeve. The blank holder is arranged on the upper end of the female mold and is used to press the outer edge of a cylindrical plate material arranged in the female mold. The male mold is above the center of the female mold in an up-down lifting mode, and can be seamlessly embedded in the blank holder. The inner part of the blank holder is provided with an electrode a. The lower end of the electrode a is in contact with the outer edge of the cylindrical plate material, and the other end is connected to a positive electrode of a power supply. The cylindrical plate material is filled with a mixture of particles and viscous fluid. The two sides of the side wall of the female mold radially drill holes at different heights and install an electrode b. One end of the electrode b is provided witha spring and connected to a negative electrode of the power supply, and the other end contacts the inner wall of the cylindrical plate material. The device solves the problems of low plasticity, highstrength, and difficult-to-deform cylindrical plate material in the asymmetric bulging process, such as difficulty in forming, cracking, residual stress and the like, and improves the forming limit capacity of the cylindrical plate material.